Breaking Dawn (The Twilight Saga Book 4) by Stephenie Meyer

"Don't be afraid," I murmured. "We belong together."
I was abruptly overwhelmed by the truth of my own words.
This moment was so perfect, so right, there was no way to doubt it.
His arms wrapped around me,
holding me against him....
It felt like every nerve ending in my body was a live wire.
"Forever," he agreed.